Omron E3X-DRT21 Operation Manual page 82

RS-422 Communication Unit Part Names and Functions
Sensor Reset Switch Press this switch to reset the connected Sensors by executing power interrup-
tion processing. This switch is used in the following case.
If the number of Sensors with communications enabled does not match the
number of Sensors connected, one or more Sensors may have become dis-
connected. The power reset switch is required to enable the Sensors to be
reconnected properly and for communications to be reestablished between
Sensors. Turning OFF the power supply would result in no response to Com-
poWay/F, which may effect the entire system. The Sensor reset switch is thus
used to reestablish communications with the Sensors.
Section 4-2
71